Index: dbmod.scm
==================================================================
--- dbmod.scm
+++ dbmod.scm
@@ -103,10 +103,11 @@
 
 	    ;; MOVE THIS CALL TO INSIDE THE sync-proc CALL
 	    (dbr:dbstruct-last-update-set! dbstruct curr-secs)
 
 	    )))
+    (assert (sqlite3:database? dbh) "FATAL: bad db handle in dbmod:with-db") 
     (if use-mutex (mutex-lock! *db-with-db-mutex*))
     (let* ((res (apply proc dbdat dbh params)))
       (if use-mutex (mutex-unlock! *db-with-db-mutex*))
       res)))